CN115491556B - Armored aluminum profile and preparation method thereof - Google Patents
Armored aluminum profile and preparation method thereof Download PDFInfo
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- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 65
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 65
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 44
- 239000000956 alloy Substances 0.000 claims abstract description 40
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 230000032683 aging Effects 0.000 claims abstract description 16
- 238000003723 Smelting Methods 0.000 claims abstract description 14
- 238000002360 preparation method Methods 0.000 claims abstract description 14
- 238000005266 casting Methods 0.000 claims abstract description 10
- 229910045601 alloy Inorganic materials 0.000 claims description 38
- 239000012535 impurity Substances 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 238000001125 extrusion Methods 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 10
- 238000000265 homogenisation Methods 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 6
- 238000000746 purification Methods 0.000 claims description 5
- 238000007670 refining Methods 0.000 claims description 5
- 238000009849 vacuum degassing Methods 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 229910052749 magnesium Inorganic materials 0.000 abstract description 10
- 229910052802 copper Inorganic materials 0.000 abstract description 9
- 230000000052 comparative effect Effects 0.000 description 15
- 239000011777 magnesium Substances 0.000 description 9
- 239000010949 copper Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- ZGUQGPFMMTZGBQ-UHFFFAOYSA-N [Al].[Al].[Zr] Chemical compound [Al].[Al].[Zr] ZGUQGPFMMTZGBQ-UHFFFAOYSA-N 0.000 description 4
- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 description 4
- QQHSIRTYSFLSRM-UHFFFAOYSA-N alumanylidynechromium Chemical compound [Al].[Cr] QQHSIRTYSFLSRM-UHFFFAOYSA-N 0.000 description 4
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 4
- WPPDFTBPZNZZRP-UHFFFAOYSA-N aluminum copper Chemical compound [Al].[Cu] WPPDFTBPZNZZRP-UHFFFAOYSA-N 0.000 description 4
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 description 4
- -1 magnesium-aluminum-manganese Chemical compound 0.000 description 4
- 239000011572 manganese Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/023—Alloys based on nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/053—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with zinc as the next major constituent
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Extrusion Of Metal (AREA)
Abstract
The invention discloses an armored aluminum profile and a preparation method thereof, belonging to the technical field of aluminum alloy, wherein the armored aluminum profile comprises the following elements in percentage by weight: mg:2.25 to 2.6 percent; si: less than or equal to 0.08 percent; fe:0.01 to 0.13 percent; cu:0.35 to 0.68 percent; ti:0.001 to 0.03 percent; zn:6.1 to 7.5 percent; mn:0.1 to 0.25 percent; cr: less than or equal to 0.01 percent; zr: 0.001-0.03%, and preparing the armored aluminum profile through smelting, casting, homogenizing, extruding and aging heat treatment. According to the invention, the contents of Mg, zn and Cu are improved at the same time, and the contents of the Mg, the Zn and the Cu are strictly controlled to obtain the aluminum alloy material meeting the armor application requirements, wherein the tensile strength can reach more than 560MPa, the yield strength can reach more than 540MPa, and the hardness can reach more than 190 HV.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy, and particularly relates to an armored aluminum profile and a preparation method thereof.
Background
The 7-series aluminum alloy has the characteristics of convenient casting, good plastic formability, high hardness, high strength and high wear resistance, and is widely applied to the fields of aviation, aerospace, military industry and the like. The invention discloses a 7-series aluminum alloy and a preparation method thereof, wherein the mechanical property of the obtained 7-series aluminum alloy is effectively improved by precisely controlling the content and the proportion of Mg and Zn, the tensile strength of the finally obtained 7-series aluminum alloy can reach more than 490MPa, the yield strength is more than 480MPa, and the Vickers hardness HV can reach more than 170. And as a Chinese patent with publication number of CN109295363A, a 7-series aluminum alloy is disclosed, which is composed of 1.95-2.2% of magnesium, 0.04-0.1% of silicon, 0.04-0.06% of iron, 0.15-0.33% of copper, 0.023-0.028% of titanium, 5.68-6.05% of zinc, 0.16-0.26% of manganese and 0.02-0.05% of zirconium and the balance of aluminum, and has the advantages of tensile strength of 470 or more, yield strength of 440 or more, vickers hardness HV of 160 or more, and good fracture toughness and fatigue resistance. And as disclosed in Chinese patent publication No. CN109136688A, the method solves the problem of unstable mechanical properties of the existing 7-series aluminum alloy in the production process by improving the solid solution degree and the aging process, and the obtained aluminum alloy plate has the tensile strength of 441 MPa-452 MPa, the yield strength of 376 MPa-393 MPa and the elongation of 12.9% -14.7%. However, the current 7-series aluminum alloy cannot meet the application requirements of modern armor in terms of mechanical properties such as hardness, strength and the like.
Disclosure of Invention
In order to overcome the defects in the prior art, the technical problems to be solved by the invention are as follows: how to provide an aluminum alloy section which can meet the application requirements of armor, the tensile strength can reach more than 560MPa, the yield strength can reach more than 540MPa, and the hardness can reach more than 190 HV.
In order to solve the technical problems, the invention adopts the following technical scheme: an armored aluminum profile comprises the following components in percentage by weight: mg:2.25 to 2.6 percent; si: less than or equal to 0.08 percent; fe:0.01 to 0.13 percent; cu:0.35 to 0.68 percent; ti:0.001 to 0.03 percent; zn:6.1 to 7.5 percent; mn:0.1 to 0.25 percent; cr: less than or equal to 0.01 percent; zr:0.001 to 0.03 percent; the balance Al.
The invention adopts the technical scheme that: the preparation method of the armored aluminum profile comprises the following steps: the mass percentages of the elements are as follows: 2.25 to 2.6 percent; si: less than or equal to 0.08 percent; fe:0.01 to 0.13 percent; cu:0.35 to 0.68 percent; ti:0.001 to 0.03 percent; zn:6.1 to 7.5 percent; mn:0.1 to 0.25 percent; cr: less than or equal to 0.01 percent; zr:0.001 to 0.03 percent; and (3) preparing the balance Al, and then smelting, casting, homogenizing, extruding and aging heat treatment to obtain the armored aluminum profile.
The invention has the beneficial effects that: the contents of Mg, zn and Cu are simultaneously improved, the contents of the three are controlled, so that the tensile strength, the yield strength and the hardness of the aluminum alloy are improved, a certain amount of Mn is added, grains can be effectively refined, the preparation and the processing of materials are facilitated, and the armored aluminum profile meeting the armor application requirements, wherein the tensile strength can reach more than 560MPa, the yield strength can reach more than 540MPa, and the hardness can reach more than 190HV, is obtained. The preparation process provided by the invention is matched with a reasonable extrusion and heat treatment process, so that the stability of the mechanical properties of the final product in the generation process is ensured.
Drawings
FIG. 1 shows a metallographic structure (50 times) of a coarse grain layer of a cross section of a head portion of an armored aluminum profile of example 5;
FIG. 2 shows a metallographic structure (50 times) of a coarse grain layer on the left side of the head of an armored aluminum profile of example 5;
FIG. 3 shows a metallographic structure (50 times) of a coarse grain layer on the right side of the head of the armored aluminum profile of example 5;
FIG. 4 shows a metallographic structure diagram (500 times) of the precipitated phases of the head cross section of the armored aluminum profile of example 5;
FIG. 5 is a metallographic structure diagram (500 times) showing the precipitated phases on the head side of the armored aluminum profile of example 5;
FIG. 6 shows a metallographic structure (50 times) of a coarse grain layer of the middle cross section of an armored aluminum profile of example 5;
FIG. 7 shows a metallographic structure (50 times) of a coarse grain layer on the left side of the middle of an armored aluminum profile of example 5;
FIG. 8 shows a metallographic structure (50 times) of the coarse grain layer on the right side of the middle of the armored aluminum profile of example 5;
FIG. 9 shows a metallographic structure diagram (500 times) of the precipitated phases of the middle cross section of the armored aluminum profile of example 5;
FIG. 10 is a metallographic structure diagram (500 times) showing the precipitated phases of the middle side of the armored aluminum profile of example 5;
FIG. 11 is a metallographic view (50 times) of the coarse grain layer of the cross section of the tail portion of the armored aluminum profile of example 5;
FIG. 12 is a metallographic view (50 times) of the coarse grain layer on the left side of the tail of the armored aluminum profile of example 5;
FIG. 13 is a metallographic structure diagram (50 times) of a coarse grain layer on the right side of the tail of the armored aluminum profile of example 5;
FIG. 14 shows a metallographic structure diagram (500 times) of the precipitated phases of the tail cross section of the armored aluminum profile of example 5;
FIG. 15 is a metallographic structure diagram (500 times) showing the precipitated phases on the tail side of the armored aluminum profile of example 5;
FIG. 16 shows inclusions (500 times) in the head, middle and tail cross-sections of the armored aluminum profile of example 5;
fig. 17 shows inclusions (500 times) in the head, middle and tail sides of the armored aluminum profile of example 5.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present invention in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
The most critical concept of the invention is as follows: by strictly controlling the content of Mg, zn and Cu and adding a certain amount of Mn, and matching with extrusion and heat treatment processes, the aluminum alloy material meeting the armor application requirements can be obtained, wherein the tensile strength can reach more than 560MPa, the yield strength can reach more than 540MPa, and the hardness can reach more than 190 HV.
The invention relates to an armored aluminum profile, which comprises the following components in percentage by weight: mg:2.25 to 2.6 percent; si: less than or equal to 0.08 percent; fe:0.01 to 0.13 percent; cu:0.35 to 0.68 percent; ti:0.001 to 0.03 percent; zn:6.1 to 7.5 percent; mn:0.1 to 0.25 percent; cr: less than or equal to 0.01 percent; zr:0.001 to 0.03 percent.
From the above description, the beneficial effects of the invention are as follows: the invention strictly controls the contents of Mg, zn and Cu to be 2.25-2.6%, 6.1-7.5% and 0.35-0.68% by simultaneously improving the contents of Mg, zn and Cu in a system containing magnesium, zinc, copper, silicon, iron, titanium, manganese, chromium and zirconium as main elements (non-impurities) so as to improve the tensile strength, yield strength and hardness of the aluminum alloy, and simultaneously controls the content of Mn to be 0.1-0.25% so as to effectively refine grains, reduce grain size difference, facilitate the preparation and processing of materials, and obtain the armored aluminum profile meeting the armor application requirements, wherein the tensile strength can be more than 560MPa, the yield strength can be more than 540MPa, and the hardness can be more than 190 HV.
Further, the content of individual impurity elements other than the above elements is not more than 0.05%, and the content of total impurity elements is not more than 0.12%.
From the above description, it is understood that controlling the content of other impurity elements within the above range does not significantly affect the mechanical properties and workability of the resulting aluminum alloy.
The preparation method of the armored aluminum profile comprises the following steps of: 2.25 to 2.6 percent; si: less than or equal to 0.08 percent; fe:0.01 to 0.13 percent; cu:0.35 to 0.68 percent; ti:0.001 to 0.03 percent; zn:6.1 to 7.5 percent; mn:0.1 to 0.25 percent; cr: less than or equal to 0.01 percent; zr:0.001 to 0.03 percent; and (3) preparing the balance Al, and then smelting, casting, homogenizing, extruding and aging heat treatment to obtain the armored aluminum profile.
Further, the preparation method specifically comprises the following steps of;
s1, respectively weighing magnesium-aluminum-manganese intermediate alloy, aluminum-silicon intermediate alloy, aluminum-iron intermediate alloy, aluminum-copper intermediate alloy, aluminum-titanium intermediate alloy, pure zinc ingot, aluminum-chromium intermediate alloy, aluminum-zirconium intermediate alloy and aluminum ingot as raw materials according to the mass percentages of the elements;
s2, all raw materials are placed into a smelting furnace for smelting, and then impurity removal and refining are sequentially carried out to obtain an aluminum alloy melt;
s3, sequentially carrying out on-line vacuum degassing, plate-type filtering and tubular filtering purification treatment on the aluminum alloy melt, and then carrying out semi-continuous water-cooling casting to obtain an alloy ingot;
s4, carrying out two-stage homogenization treatment on the alloy ingot at the temperature of 350-400 ℃ for 2-4 h and at the temperature of 430-480 ℃ for 3-6 h to obtain an aluminum alloy ingot;
s5, heating the aluminum alloy cast ingot to 450-520 ℃, placing the aluminum alloy cast ingot in an extruder die at 490-510 ℃, extruding and forming at a speed of 3-8 m/min, and then water-cooling to obtain a primary section bar; preferably, extrusion at a speed of 5 to 6 m/min;
s6, performing double-stage aging heat treatment on the primary section bar at 120-140 ℃ for 6-10 h and at 150-170 ℃ for 12-16 h, and polishing and grinding to obtain the armored aluminum section bar.
From the description, the S1-S3 follow the conventional flow process, the performance of the finished product is not obviously affected under the compliance operation, proper extrusion and heat treatment processes are required to be adjusted in the processing process, the extrusion temperature and speed are required to be precisely controlled, the temperature difference of the two-stage aging treatment is not easy to be too large, and the high mechanical property of the obtained armored aluminum profile is further ensured.
Example 1:
an armored aluminum profile consists of the following elements in percentage by weight: mg:2.4%; si:0.05%; fe:0.13%; cu:0.6%; ti:0.001%; zn:7.0%; mn:0.25%; cr:0.003%; zr:0.014%; the balance Al;
the content of single impurity elements outside the elements is less than or equal to 0.05 percent, and the content of total impurity elements is less than or equal to 0.12 percent.
The preparation method of the armored aluminum profile of the embodiment 1 comprises the following steps:
s1, respectively weighing magnesium-aluminum-manganese intermediate alloy, aluminum-silicon intermediate alloy, aluminum-iron intermediate alloy, aluminum-copper intermediate alloy, aluminum-titanium intermediate alloy, pure zinc ingot, aluminum-chromium intermediate alloy, aluminum-zirconium intermediate alloy and aluminum ingot as raw materials according to the mass percentages of the elements;
s2, all raw materials are placed into a smelting furnace for smelting, and then impurity removal and refining are sequentially carried out to obtain an aluminum alloy melt;
s3, sequentially carrying out on-line vacuum degassing, plate-type filtering and tubular filtering purification treatment on the aluminum alloy melt, and then carrying out semi-continuous water-cooling casting to obtain an alloy ingot;
s4, carrying out two-stage homogenization treatment on the alloy ingot at 350 ℃ for 3h and at 480 ℃ for 5h to obtain an aluminum alloy ingot;
s5, heating an aluminum alloy cast ingot to 480 ℃, placing the aluminum alloy cast ingot in an extruder die at 500 ℃, extruding and forming at a speed of 6m/min, and then water-cooling to obtain a primary profile;
s6, performing two-stage aging heat treatment on the primary section bar at 140 ℃ for 8h and at 170 ℃ for 12h, and polishing and grinding to obtain the armored aluminum section bar.
Example 2:
an armored aluminum profile consists of the following elements in percentage by weight: mg:2.25%; si:0.08%; fe:0.01%; cu:0.5%; ti:0.005%; zn:6.3%; mn:0.1%; cr:0.01%; zr:0.03%; the balance Al;
the content of single impurity elements outside the elements is less than or equal to 0.05 percent, and the content of total impurity elements is less than or equal to 0.12 percent.
The preparation method of the armored aluminum profile of the embodiment 2 comprises the following steps:
s1, respectively weighing magnesium-aluminum-manganese intermediate alloy, aluminum-silicon intermediate alloy, aluminum-iron intermediate alloy, aluminum-copper intermediate alloy, aluminum-titanium intermediate alloy, pure zinc ingot, aluminum-chromium intermediate alloy, aluminum-zirconium intermediate alloy and aluminum ingot as raw materials according to the mass percentages of the elements;
s2, all raw materials are placed into a smelting furnace for smelting, and then impurity removal and refining are sequentially carried out to obtain an aluminum alloy melt;
s3, sequentially carrying out on-line vacuum degassing, plate-type filtering and tubular filtering purification treatment on the aluminum alloy melt, and then carrying out semi-continuous water-cooling casting to obtain an alloy ingot;
s4, carrying out two-stage homogenization treatment on the alloy ingot at 400 ℃ for 2h and at 430 ℃ for 6h to obtain an aluminum alloy ingot;
s5, heating an aluminum alloy cast ingot to 520 ℃, placing the aluminum alloy cast ingot in an extruder die at 510 ℃, extruding and forming at a speed of 3m/min, and then water-cooling to obtain a primary profile;
s6, performing double-stage aging heat treatment on the primary section bar at 120 ℃ for 10h and at 150 ℃ for 16h, and polishing and grinding to obtain the armored aluminum section bar.
Example 3:
an armored aluminum profile consists of the following elements in percentage by weight: mg:2.6%; si:0.03%; fe:0.08%; cu:0.35%; ti:0.03%; zn:6.1%; mn:0.2%; cr:0.008%; zr:0.001%; the balance Al;
the content of single impurity elements outside the elements is less than or equal to 0.05 percent, and the content of total impurity elements is less than or equal to 0.12 percent.
The preparation method of the armored aluminum profile of the embodiment 3 comprises the following steps:
s1, respectively weighing magnesium-aluminum-manganese intermediate alloy, aluminum-silicon intermediate alloy, aluminum-iron intermediate alloy, aluminum-copper intermediate alloy, aluminum-titanium intermediate alloy, pure zinc ingot, aluminum-chromium intermediate alloy, aluminum-zirconium intermediate alloy and aluminum ingot as raw materials according to the mass percentages of the elements;
s2, all raw materials are placed into a smelting furnace for smelting, and then impurity removal and refining are sequentially carried out to obtain an aluminum alloy melt;
s3, sequentially carrying out on-line vacuum degassing, plate-type filtering and tubular filtering purification treatment on the aluminum alloy melt, and then carrying out semi-continuous water-cooling casting to obtain an alloy ingot;
s4, carrying out two-stage homogenization treatment on the alloy ingot at 380 ℃ for 3h and at 460 ℃ for 5h to obtain an aluminum alloy ingot;
s5, heating an aluminum alloy cast ingot to 450 ℃ and placing the aluminum alloy cast ingot in an extruder die at 490 ℃, extruding and forming at a speed of 8m/min, and then water-cooling to obtain a primary profile;
s6, performing two-stage aging heat treatment on the primary section bar at 130 ℃ for 6h and at 160 ℃ for 14h, and polishing and grinding to obtain the armored aluminum section bar.
Example 4:
an armored aluminum profile consists of the following elements in percentage by weight: mg:2.51%; si:0.04%; fe:0.11%; cu:0.68%; ti:0.001%; zn:7.5%; mn:0.18%; cr:0.003%; zr:0.01%; the balance Al;
the content of single impurity elements outside the elements is less than or equal to 0.05 percent, and the content of total impurity elements is less than or equal to 0.12 percent.
The procedure of example 1 was followed except that the extrusion molding speed of the armored aluminum profile of example 4 was 5 m/min.
Example 5:
an armored aluminum profile consists of the following elements in percentage by weight: mg:2.39%; si:0.03%; fe:0.091%; cu:0.394%; ti:0.0135%; zn:7.31%; mn:0.15%; cr:0.003%; zr:0.012%; ni:0.008%; v:0.006%; pb:0.001%; sn:0.001%; na:0.001%; b:0.00052%; ga:0.0131%; cd:0.001%; the balance Al. The armored aluminum profile of example 5 was prepared in the same manner as in example 1.
The armored aluminum section bar provided by the invention can be used as an armored material, is also suitable for sand surface anode treatment and high-light anode treatment, can meet various dyeing processes, and can be used as a section bar of electronic products (such as mobile phones and computer shells).
Comparative example 1:
comparative example 1 differs from example 1 only in S5, S5 of comparative example 1 being: heating an aluminum alloy cast ingot to 460 ℃, placing the aluminum alloy cast ingot in an extruder die at 480 ℃, extruding and forming at a speed of 2m/min, and then air-cooling to obtain a primary section;
comparative example 2:
comparative example 2 differs from example 1 only in S6, S6 of comparative example 2 being: and (3) carrying out aging heat treatment on the primary section bar at 180 ℃ for 20 hours, and then polishing and grinding to obtain the armored aluminum section bar.
Comparative example 3:
comparative example 3 differs from example 1 in the elemental composition, but the process for preparing the profile is identical;
the armored aluminum profile of the comparative example 3 consists of the following elements in percentage by weight: mg:2.1%; si: 0.032; fe:0.068%; cu:0.16%; ti:0.0103%; zn:6.04%; mn:0.206%; cr:0.0028%; zr:0.015%; the balance Al;
the content of single impurity elements outside the elements is less than or equal to 0.05 percent, and the content of total impurity elements is less than or equal to 0.12 percent.
The chemical composition tests of the armored aluminum profiles of examples 1-5 are referenced in GB/T7999-2007.
The armored aluminum profiles obtained in examples 1 to 5 were tested, and the test standards were referred to GB/T228.1 2010, GB/T4340.1 2009 and GB/T3246.1, and the test results are shown in tables 1 and 2. The mechanical properties of the different parts of the obtained armored aluminum profile are different, so that the head part, the middle part and the tail part are respectively detected, and the results are recorded in the form of range values in tables 1 and 2.
TABLE 1
| Tensile strength (MPa) | Yield strength (Mpa) | Elongation (%) | Vickers Hardness (HV) | |
| Example 1 | 566～575 | 548～550 | 7.0～8.0 | 195～199 |
| Example 2 | 562～567 | 544～548 | 8.1～9.3 | 192～197 |
| Example 3 | 572～579 | 551～556 | 6.9～7.6 | 199～205 |
| Example 4 | 569～577 | 549～553 | 7.1～8.3 | 198～203 |
| Example 5 | 569～575 | 547～551 | 7.8～9.5 | 196～202 |
| Comparative example 1 | 505～530 | 455～480 | 6.5～9.0 | 150～170 |
| Comparative example 2 | 530～545 | 510～515 | 8.5.～9.8 | 178～185 |
| Comparative example 3 | 485～505 | 465～485 | 10.5.～12.8 | 165～175 |
TABLE 2
| Grain size in cross section (μm) | Grain size in horizontal plane (μm) | Precipitated phase (mum) | Thickness of coarse grain layer (mum) | |
| Example 1 | 60～110 | 60～130 | 4～8 | ≤500 |
| Example 2 | 50～110 | 50～130 | 4～8 | ≤500 |
| Example 3 | 45～110 | 50～130 | 4～9 | ≤500 |
| Example 4 | 40～110 | 50～130 | 4～8 | ≤500 |
| Comparative example 1 | 30～110 | 60～130 | 6～15 | ≤500 |
| Comparative example 2 | 60～110 | 60～130 | 5～9 | ≤500 |
| Comparative example 3 | 45～120 | 45～130 | 4～10 | ≤500 |
The armored aluminum profile obtained in example 5 was tested for three points, the head, the middle and the tail. The instruments used for the test comprise a direct-reading emission spectrometer, a metallographic microscope, a Vickers hardness tester and a universal material tester; the standards of the test references are GB/T7999 2007, GB/T4340.1-2009, GB/T3246.1 and GB/T228.1 2010; the ambient temperature and humidity at the time of the test are respectively: 23.+ -. 5 ℃ and 40% RH. Wherein, the horizontal direction of the cross section is simply called as the side surface; the horizontal direction of the longitudinal section is simply referred to as a large surface; the cross section is in the vertical direction for short.
The test results of the coarse-grain layer thickness, grain size, grain grade are shown in tables 3 to 4.
TABLE 3 Table 3
TABLE 4 Table 4
As can be seen by combining fig. 1 to 17 and tables 3 to 4, the armored aluminum profile provided by the invention has no obvious coarse grain layer, small grain size, uniform grains and small grain size difference; and the precipitated phases are uniformly distributed, and the size of the precipitated phases is small.
In summary, the content of Mg, zn and Cu is simultaneously improved, the content of the Mg, zn and Cu is controlled, and meanwhile, the reasonable extrusion and aging treatment process is matched, so that the tensile strength, the yield strength and the hardness of the aluminum profile are improved, the product mechanical property of the armored aluminum profile with the tensile strength of more than 560MPa, the yield strength of more than 540MPa and the hardness of more than 190HV is obtained.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent changes made by the specification and drawings of the present invention, or direct or indirect application in the relevant art, are included in the scope of the present invention.
Claims (3)
1. The preparation method of the armored aluminum profile is characterized by comprising the following elements in percentage by weight: 2.25 to 2.6 percent; si: less than or equal to 0.08 percent; fe:0.01 to 0.13 percent; cu:0.35 to 0.68 percent; ti:0.001 to 0.03 percent; zn:6.1 to 7.5 percent; mn:0.1 to 0.25 percent; cr: less than or equal to 0.01 percent; zr:0.001 to 0.03 percent; the balance Al is prepared, and then the armored aluminum profile is obtained through smelting, casting, homogenization, extrusion and aging heat treatment;
the homogenization treatment is two-stage homogenization treatment of preserving heat for 2-4 h at 350-400 ℃ and preserving heat for 3-6 h at 430-480 ℃;
the extrusion is specifically as follows: heating an aluminum alloy cast ingot to 450-520 ℃ and placing the aluminum alloy cast ingot in an extruder die at 490-510 ℃, extruding and forming at a speed of 3-8 m/min, and then water-cooling to obtain a primary section;
the aging heat treatment is a two-stage aging heat treatment;
the two-stage aging heat treatment is to keep the temperature between 120 and 140 ℃ for 6 to 10 hours and between 150 and 170 ℃ for 12 to 16 hours.
2. The method for producing an armored aluminum profile according to claim 1, wherein the content of individual impurity elements is not more than 0.05%, and the content of total impurity elements is not more than 0.12%.
3. The method for preparing the armored aluminum profile according to claim 1, which comprises the following steps:
s1, weighing raw materials according to the weight percentage of the elements;
s2, all raw materials are placed into a smelting furnace for smelting, and then impurity removal and refining are sequentially carried out to obtain an aluminum alloy melt;
s3, sequentially carrying out on-line vacuum degassing, plate-type filtering and tubular filtering purification treatment on the aluminum alloy melt, and then carrying out semi-continuous water-cooling casting to obtain an alloy ingot;
s4, homogenizing the alloy ingot to obtain an aluminum alloy ingot;
s5, placing the aluminum alloy cast ingot into an extruder die for extrusion molding, and then performing water cooling to obtain a primary profile;
s6, polishing and grinding the primary section bar after aging heat treatment to obtain the armored aluminum section bar.
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